Composite metal-work.



L. S. LAGHMAN. COMPOSITE METAL WORK.

APPLICATION FILED NOV. 26, 1918.

1,1 1 1,393, Patented Sept. 22, 1914.

W/T/VESSES INVE/VTUR UNITED STATES PATENT OFFICE.

LAURENCE s. LAGHMAN, on NEW YORK, N. Y., AssIGnoR TO NI'vEnsAL swarm wELnInG COMPANY, hr NEW YORK, N. Y., A conronarxon or NEW YORK.

Specification of Letters Patent.

Patented Sept. 22, 1914.

Original application and June is, 1910, Serial No. 567,152. Divided and this application filed rim/ember I 26,1913. Serial No. 803,123. 1

To all whom it may concern:

Be it known that I, LAURENCE S. Lacu- MAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvementsin lomposite hIetal-VVork, of which the fol-' lowing is a specification.

My present invention relates to composite metal work and more particularly to those forms in which one of the members projects in a lateraldirection from the other member.

The main object 'of the invention is to simplify and cheapen the cost of manufacture of metal work wherein it is desired to provide a pin, screw or similar device projecting in a lateral directionfrom the member to which it is secured. To effect this result the parts are preferably electrically welded to each other, and to assist' in this operation as well as to attain a commercial, practical article the projecting pin or screw is of a specific type having a rounded or curved head united to a shank of smaller diameter by a substantially square shoulder:

The invention consists in the; new and novel composite metal work secured together in the manner hereinafter more particularly described and then specified in the claims.

In the accompanying drawings, Figure '1 is a side elevation of a device showing members in position previous to welding in accordance with this invention. Fig. 2 is a plan and partial section of the parts shown in. Fig. 1 before welding. Fig. 3 is a side elevation of the device shown in Fig.- 1 after welding the parts together. Fig. 4 illustrates a modified form of work, the parts being held between suitable clamping electrodes. Fig. 5 is a front elevation of the work illustrated in Fig. 4. Fig. 6 illustrates a modification in theforurof the members to be joined and Fig. 7 is a horizontal section through the same on the line X X.

To illustrate my present invention, it is shown as applied to joining pieces of metal of various shapes and forms but it will be understood that the invention as set out 'in the appended claims is not limited to the particular forms of the parts shown but is' equally applicable to numerous other forms in which it is desired to have one member project in a lateral direction from the other.

The'*invention' is particularly useful in metal structures wherein it is desired to provide one member of a structure with means whereby another member or part can be secured to it, skeleton metallic baby. carriages being,an instance of this use, in which case the framework consists mainly of tubes or tened to the tube or rod by the screw, rivet, 6 5 &c., although other uses to which the invention might be put will be'evident and within the scopeof the appended claims.

. Referring to the drawings Figs. 1, 2 and 3,

1 indicates a tubular length of metal to 7b which vthe pins 2 are to be secured. The pins 2 might be of any desired character such as a screw,-r1vet, split pin or any other form of fastening device or rod which it is desired to secure to the part 1 in a generaL lateral projecting direction; The pins 2 are.

provided with a head 3 of larger diameter than the body portion of the pins, the heads having a rounded or convex surface at the apex and a substantially square shoulderat 3 0 the junction of the head and the body of the 1 pin.

part 1 in such position that the rounded sur- Theepin is placed against the member or.

face of the head 3 butts against the side or 5 periphery of the part 1 and the pin 2 proects in a general lateral direction there-' from.

The parts are assembled between suitable 1" current carrying electrodes of any suitable kind whereby the parts may be joined to get-her by the employment of the electric welding process now well known in the art. One manner of so joining them is illustrated in Fig. 2 in which 4 indicates one of the eleco5 trodes adapted to engage the outer peripl'r-acry of the tubular member 1 in a line with the pin 2. The other electrode, indicatedjat 5, is preferably bored out to permit the in sertion of the body of the pin 2, the shoulder. 1

at the head seating on the outer surface of the electrode, one of the objects of the shoulder being that it affords an abutment- 7 against which the electrode presses when applying the welding pressure necessary to 10;} complete the welding operation and thus,

expensive and troublesome clamping devices} to grip the periphery of the pin are avoidedi' As is now well known to those skilled in the electric metal working art, the electric current passes from the one electrode to the other and softens the work at the unction of the two parts and by simultaneously applying pressure thereto the parts become integrally united. As the current flows from one part to the other and pressure is ap plied the head 3 coalesces with the metal of the member 1, the attendant bur caused by the upsetting pressure being taken up in the space betw en. the rounded head and the surface or" the member 1, whereby, when the welding operation is finished, a clean hear; ing surface is left at the shoulder of the head. whereby the necessity of using any finishing tool to remove the bur is avoided. This is important as often the necessity of removing the bur after welding makes the use f the electric welding process prohihitu'e 8 providing the pin with a rounded sur ace a restricted area of contact is attained with the opposite part, whereby initial contact of small to readily start the heating is provided.

As shown in Fig. 3, the upsetting pres sure is continued until the shoulder on the pin comes into alinemcnt with the vertical line of the surface of the member 1, but obviously, if desired, the welding operation might be completed before this tune and the shoulder be raised more or less from the surface of the member to which the pin is se-- cured, as is the case when the head is welded to the rod shown in Figs. 6 and 7 or to a plate or fiat surface as illustrated in Fig. 4-. In the form illustrated in Figs. 4: and 5 the pin 2 is welded to the surface of a plate 6 in a similar manner to that previously described, the bur being taken up by the space between the rounded head 3 and the surface of the plate 6.

in Figs. 6 and 7 the pin is shown as to be welded to a rod 7, the bur after welding being'all located back of the shoulder on the pin, whereby a clean, square bearing surface ,is provided against which parts which are to be fastened to the rod 7 may squarely seat.

This application is a division of my ap plication for patent filed June 16th 1910, Se

rial lrl umber 567,1

by said head. 7

3. Composite metal work comprising two members, one of said members having a rounded head of larger diameter than the body and a square shoulden said headed member being welded laterally to the other member by the rounded surface oi -said head whereby a smooth .squareyfshoiilder is presented at the junction o'f tlie't wo members.

4-. Composite metal wo1'k' comprising a tubular length of metal and a laterally proj eeting pin provided with a head and a subst'antially square shoulder at the junction of the pin and head, said pin being-welded to said tubular member by said h'ead 5. Composite metal work comprising two' members, one of said membersfliaving .a rounded head of larger diameter than. the body portion, the head being Welded to the surface of the other member.

GuCOIHPOSltB metal work con'iprising a member havinga curved surface and a sec 0nd member having ahead of larger ditliill ei ter than the body portion, theheadheing welded to the curved surface of the first named member. 7 v

7. Composite metal work comprising 'a member having a curved suri'ace ti'nd a headed shank having a head of larger di ameter than the shank and a substantially.

square shoulder connecting the head and the shank, said head being Welded to the curved surface of said first-named'memben' Signed at New York in the county of New York and State of New York this 24th day of November A. 11,1913.

LAURENCE S. LAOHMAN. lvitnesses:

F. B. TOWNSEND, HENRY A. GENE. 

